<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    
    div{
      background-color: red;
      width: 200px;
      height: 200px;
    }
  </style>
</head>
<body>


  <div>
    
  </div>

</body>
</html>